Lab 2: Muscles origin, insertion, and action Flashcards
Iliopsoas M.
Origin: Ilium, Sacrum, T12, and lumbar vertebrae
Insertion: Lesser trochanter and proximal femur
Action: Hip flexion and abduction of thigh
Gluteus Maximus
Origin: Ilium, Sacrum, Cocyx
Insertion: Gluteal Tuberosity
Action: Extends and abducts thigh
Gluteus Medius
Origin: Lateral surface of Ilium
Insertion: Greater trochanter
Action: Abducts and medially rotates thigh
Sartorius
Origin: Anterior superior iliac spine
Insertion: Medial aspect of proximal tibia
Action: Flexes, abducts, and laterally rotates thigh
Rectus Femoris
Origin: Anterior inferior iliac spine
Insertion: Tibial tuberosity
Action: Flexes the thigh and extends the leg
Vastus muscle group
Origin: Greater trochanter, intertrochanteric line, proximal femoral diaphysis
Insertion: Tibial tuberosity
Action: Extends the leg
Adductor muscle group
longus in front, magnus in back
Origin: Pubic bone
Insertion: Linea aspera
Action: Addcuts, medially rotates thigh
Biceps Femoris
Origin: Ischial tuberosity, linea aspera
Insertion: Head of fibula, lateral condyle of tibia
Action: Extends laterally rotates thigh, flexes leg
Semitendinosus
Origin: Ischial tuberosity
Insertion: Proximal, medial tibia
Action: Extends, medially rotates thigh, flexes leg
Semimembranosus
Origin: Ischial tuberosity
Insertion: Proximal, medial tibia, lateral condyle of femur
Action: Extends, medially rotates thigh, flexes leg
Gastrocnemius
Origin: Medial and lateral femoral condyles
Insertion: Posterior calcaneus
Action: Plantarflexes foot, flexes leg
Tibialis Anterior
Origin: Proximal tibia
Insertion: Base of first metatarsal and medial cuneiform
Action: Dorsiflexes and inverts foot
Orbicularis oculi
Origin: Orbital regions of frontal and maxillary bones
Insertion: Skin around the orbit and eyelids
Action: Closes, squints eyes
Orbicularis Oris
Origin: Maxilla, mandible
Insertion: Skin and connective tissue around the lips
Action: Closes, protrudes lips
Masseter
Origin: Zygomatic arch
Insertion: Angle and lateral surface of mandibular ramus
Action: Elevates the madible
Sternocleidomastoid
Origin: Manubriu, medial clavicle
Insertion: Mastoid process
Action: Head flexion and rotation
Trapezius
Origin: Oxxiptal bone, C7, thoracic vertebrae
Insertion: Acromion spine of scapula, clavicle
Action: Stabilizes, raises, rotates scapula
Rectus abdominis
Origin: Pubic crest, pubic symphysis
Insertion: Zyphoid process, ribs 5-7
Action: Flexes/rotates vertebral column, increases intraabdominal pressure
External oblique
Origin: Lower 8 ribs
Insertion: Linea alba
Action: Flexes, rotates, and laterally flexes trunk.
Internal oblique
Origin: Lumbar fascia, iliac crest
Insertion: Linea alba, pubic crest, last 3-4 ribs
Action: Flexes, rotates, and laterally flexes trunk.
Erector spinae
Origin: Very broad origin- from iliac crest, ribs, and vertebrae
Insertion: Ribs, vertebrae, and the skull
Action: Postural muscles that keep the spine erect; extends trunk
Deltoid
Origin: Lateral clavicle, acromion, spine of scapula
Insertion: Deltoid tuberosity of humerus
Action: Abducts, flexes, extends, and rotates arms
Pectoralis major
Origin: Clavicle, ribs 1-6, sternum
Insertion: Intertubercular groove of humerus
Action: Flexes and adducts arm
Latissimus dorsi
Origin: Iliac crest, lumbar and lower thoracic vertebrae, lower ribs
Insertion: Intertubercular groove of humerus
Action: Extends and adducts arm
Biceps brachii
Origin: Coracoid process, glenoid cavity
Insertion: Radial tuberosity
Action: Flexes forearm
Triceps brachii
Origin: Scapula, posterior humerus
Insertion: Olecranon process
Action: Extends forearm
Brachioradialis
Origin: Distal humerus
Insertion: Styloid process of radius
Action: Flexes forearm
